Energy-saving portable interlocking system for hydraulic slips and hydraulic elevator

Abstract

The invention relates to an energy-saving portable interlocking system for a hydraulic slip and a hydraulic elevator, and belongs to the technical field of petroleum drilling and production equipment, the energy-saving portable interlocking system comprises a power unit, a control unit and a portable interlocking unit which are connected in sequence, the power unit is used for providing oil for a hydraulic cylinder on the hydraulic slip, and the control unit is used for controlling the portable interlocking unit. The control unit is used for controlling the pressure when the hydraulic slips are clamped and opened; the portable interlocking unit comprises a first interlocking oil way and a second interlocking oil way, the input end of the first interlocking oil way and the output end of the second interlocking oil way are both connected with the control unit, and the input end of the first interlocking oil way and the output end of the first interlocking oil way are connected with a hydraulic cylinder on a hydraulic slip; according to the invention, the flexible driving, the safe interlocking, the flexible unlocking and the energy-saving control of the wellhead tool are realized by combining the switching pressure control, the energy accumulator pressure stabilization, the back pressure maintaining device, the unloading valve and the action reversing valve, namely, the action stability, the convenience, the safety and the working efficiency are improved.

Description

Technical Field

[0001] This invention relates to an energy-saving portable interlocking system for hydraulic slips and hydraulic lifting clamps, belonging to the technical field of oil drilling and production equipment. Background Technology

[0002] Hydraulic slips are tools used in oil, gas, and cementing operations to hold various types of tubing strings.

[0003] Traditional hydraulic power systems in oilfields typically suffer from the following problems: 1. The pressure control is rough. The pressure is usually the system pressure. Under the premise of high torsional resistance, a high system pressure is required. The pressure is the same in different pipelines in the system. When the slip opens, it causes energy waste.

[0004] 2. High impact: When the hydraulic cylinder reverses rapidly, it is prone to high-frequency impact, which leads to a reduction in the life of the slips.

[0005] 3. Insufficient safety, lack of accumulator pressure holding and throttling stability control, etc., leads to hydraulic slip vibration and instability.

[0006] 4. The hydraulic slip action and the lifting action are not automatically interlocked, which can easily lead to dangerous operation.

[0007] 5. High noise and energy consumption; traditional power stations are in continuous loading mode and cannot intelligently unload.

[0008] Therefore, there is a need for an energy-saving, portable interlocking system for hydraulic slips and hydraulic clamps to improve operational smoothness, safety, and work efficiency. Summary of the Invention

[0009] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide an energy-saving portable interlocking system for hydraulic slips and hydraulic lifting clamps to improve the smoothness, convenience, safety and work efficiency of operation.

[0010] The technical solution adopted by the present invention to solve the above problems is as follows: an energy-saving portable interlocking system for hydraulic slips and hydraulic clamps, comprising a power unit, a control unit and a portable interlocking unit connected in sequence, wherein the power unit is used to supply oil to the hydraulic cylinder on the hydraulic slip, and the control unit is used to control the pressure when the hydraulic slip clamps and opens; The portable interlock unit includes an interlocking first oil circuit and an interlocking second oil circuit. The input end of the interlocking first oil circuit and the output end of the interlocking second oil circuit are both connected to the control unit. The input end of the interlocking first oil circuit and the output end of the interlocking first oil circuit are connected to the hydraulic cylinder on the hydraulic slip. A first relay switch is connected to the first interlocking oil circuit, and a second check valve is connected to the second interlocking oil circuit; The first interlocked oil circuit and the second interlocked oil circuit are connected by an interlocked pipeline. A second reversing valve, a third reversing valve and a third check valve are connected to the interlocked pipeline. The second reversing valve and the third reversing valve are both connected to the second interlocked oil circuit. The portable interlock unit is also connected to a valve block unit; The valve block unit includes a first low-pressure relief valve and a high-pressure relief valve. The first interlocking oil circuit and the second interlocking oil circuit are connected through the first low-pressure relief valve. The first interlocking oil circuit and the second interlocking oil circuit are connected through the high-pressure relief valve. The high-pressure relief valve is connected to the hydraulic cylinder on the hydraulic slip through the second low-pressure relief valve and the stroke valve.

[0011] Preferably, the power unit includes an oil tank, on which a first oil inlet line and a first oil return line are connected. A plunger pump and a first check valve are sequentially connected along the oil inlet direction on the first oil inlet line. The plunger pump is connected to a drive source. An unloading valve is also connected to the first oil inlet line.

[0012] Preferably, the driving source is a motor.

[0013] Preferably, the control unit includes a second oil inlet line, a second oil return line, and a first directional valve. The input end of the second oil inlet line is connected to the output end of the first oil inlet line, and the output end of the second oil return line is connected to the input end of the first oil return line. The input end of the second oil return line and the output end of the second oil inlet line are both connected to the portable interlock unit through the first directional valve. The control unit further includes a low-pressure relief valve and a high-pressure relief valve. The input terminals of the low-pressure relief valve and the high-pressure relief valve are both connected to the second oil inlet line. The output terminals of the low-pressure relief valve and the high-pressure relief valve are both connected to the second oil return line. The control terminals of the high-pressure relief valve and the low-pressure relief valve are respectively connected to the oil inlet and oil outlet of the portable interlock unit.

[0014] Preferably, the input end of the interlocked first oil circuit is connected to the control end of the first directional valve and the control end of the high-pressure relief valve, and the output end of the interlocked second oil circuit is connected to the control end of the first directional valve and the control end of the low-pressure relief valve.

[0015] Preferably, the first directional valve is a two-position four-way directional valve.

[0016] Preferably, an energy storage device and a pressure gauge are connected to the second oil inlet pipeline.

[0017] Preferably, an adjustable flow valve is connected to the second return oil line.

[0018] Preferably, the second directional valve is a manual two-position three-way directional valve, and the third directional valve is a solenoid two-position four-way directional valve.

[0019] Preferably, the stroke valve is normally open.

[0020] Compared with the prior art, the advantages of the present invention are as follows: This invention provides an energy-saving portable interlocking system for hydraulic slips and hydraulic lifting clamps. It combines switching pressure control, accumulator pressure stabilization, back pressure maintenance device, unloading valve, and action reversing valve to achieve flexible drive, safety interlocking, flexible unlocking, and energy-saving control of wellhead tools, thereby improving the smoothness, convenience, safety, and work efficiency of the operation. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of an energy-saving portable interlocking system for hydraulic slips and hydraulic lifting clamps according to the present invention; Figure 2 A schematic diagram illustrating the principle of hydraulic slips for removing portable interlock signal feedback; Figure 3 This is a schematic diagram of the power unit structure; Figure 4 This is a schematic diagram of the control unit. Figure 5 This is a schematic diagram of the portable interlocking unit. Figure 6 This is a schematic diagram of the valve block unit. Figure 7 This is a schematic diagram of the fourth directional valve controlling the opening and closing of the hydraulic clamp.

[0022] in: Power unit 1, control unit 2, portable interlock unit 3, valve block unit 4, hydraulic cylinder 5, wedge block 6, hydraulic lifting clamp 7; Oil tank 11, first oil inlet line 12, first oil return line 13, plunger pump 14, first check valve 15, motor 16, unloading valve 17. Second oil inlet line 21, second oil return line 22, first directional valve 23, accumulator 24, pressure gauge 25, adjustable flow valve 26, low-pressure relief valve 27, high-pressure relief valve 28. Interlocking first oil circuit 31, interlocking second oil circuit 32, first relay switch 33, second check valve 34, interlocking pipeline 35, second reversing valve 36, third reversing valve 37, third check valve 38, fourth reversing valve 39, second relay switch 30; Valve block first low-pressure relief valve 41, valve block high-pressure relief valve 42, valve block second low-pressure relief valve 43, and stroke valve 44. Detailed Implementation

[0023] like Figures 1 to 7 As shown, an energy-saving portable interlocking system for hydraulic slips and hydraulic clamps in this embodiment includes a power unit 1, a control unit 2 and a portable interlocking unit 3 connected in sequence. The portable interlocking unit 3 is also connected to a valve block unit 4. The power unit 1 is used to supply oil to the hydraulic cylinder 5 on the hydraulic slips. The control unit 2 is used to control the pressure when the hydraulic slips are clamped and opened. The power unit 1 includes an oil tank 11, on which a first oil inlet line 12 and a first oil return line 13 are connected. A plunger pump 14 and a first check valve 15 are sequentially connected along the oil inlet direction on the first oil inlet line 12. The plunger pump 14 is connected to a drive source, which is a motor 16. An unloading valve 17 is also connected to the first oil inlet line 12. When motor 16 starts, it causes piston pump 14 to run, thereby outputting oil from oil tank 11 to provide the main oil source. When the hydraulic slips do not move, the unloading valve 17 reduces the pump flow to a low pressure by meeting the system pressure, thus improving service life and saving 30% to 60% of energy. The control unit 2 includes a second oil inlet line 21, a second oil return line 22, and a first directional valve 23. The input end of the second oil inlet line 21 is connected to the output end of the first oil inlet line 12, and the output end of the second oil return line 22 is connected to the input end of the first oil return line 13. The input end of the second oil return line 22 and the output end of the second oil inlet line 21 are both connected to the portable interlock unit 3 through the first directional valve 23. The first directional valve 23 is a two-position four-way directional valve. An energy storage device 24 and a pressure gauge 25 are connected to the second oil inlet line 21, and an adjustable flow valve 26 is connected to the second oil return line 22. The control unit 2 further includes a low-pressure relief valve 27 and a high-pressure relief valve 28. The input terminals of the low-pressure relief valve 27 and the high-pressure relief valve 28 are both connected to the second oil inlet line 21. The output terminals of the low-pressure relief valve 27 and the high-pressure relief valve 28 are both connected to the second oil return line 22. The control terminals of the high-pressure relief valve 28 and the low-pressure relief valve 27 are respectively connected to the oil inlet and the oil outlet of the portable interlock unit 3. The function of the high-pressure relief valve 28 is to control the clamping pressure of the hydraulic slips and increase the torque resistance of the hydraulic slips. The function of controlling the low-pressure relief valve 27 is to control the opening pressure of the main hydraulic slip, so that the slip can be opened without high pressure; An adjustable flow valve 26 is installed at the return end of the second return oil line 22 to make the hydraulic cylinder 5 move smoothly and avoid impact and creep. When the pressure is applied, it is continuously supplied through the accumulator; The first directional valve 23 is used to drive the extension and retraction of the hydraulic cylinder 5 on the hydraulic slip; The portable interlock unit 3 includes an interlocking first oil circuit 31 and an interlocking second oil circuit 32. The input end of the interlocking first oil circuit 31 and the output end of the interlocking second oil circuit 32 are both connected to the control unit 2. Specifically, the input end of the interlocking first oil circuit 31 is connected to the control end of the first reversing valve 23 and the control end of the high-pressure relief valve 28, and the output end of the interlocking second oil circuit 32 is connected to the control end of the first reversing valve 23 and the control end of the low-pressure relief valve 27. The input end and the output end of the interlocking first oil circuit 31 are connected to the hydraulic cylinder 5 on the hydraulic slip. A first relay switch 33 is connected to the first interlocked oil circuit 31, and a second check valve 34 is connected to the second interlocked oil circuit 32. The interlocked first oil circuit 31 and the interlocked second oil circuit 32 are connected by an interlocked pipeline 35. A second directional valve 36, a third directional valve 37 and a third check valve 38 are connected to the interlocked pipeline 35. The second directional valve 36 and the third directional valve 37 are both connected to the interlocked second oil circuit 32. The second directional valve 36 is a manual two-position three-way directional valve, and the third directional valve 37 is a solenoid two-position four-way directional valve. The hydraulic slip closes the high-pressure output signal, which is output through the first relay switch 33. The third directional valve 37 can realize the interlock function. After the signal output is output in conjunction with the clamp, the third directional valve 37 can be energized. The hydraulic system of the entire slip can only open when the oil circuit is opened and oil is introduced, and the hydraulic slip can be opened. In emergency operation, the second directional valve 36 can be switched to the oil-flow state, controlling the second check valve 34 to open, opening the oil circuit to flow oil, disabling the interlock system function, and can be used to open the emergency slip; It should be noted that, in fact, the inlet and outlet oil lines of the hydraulic lifting clamp 7 are connected through the fourth directional valve 39, and the hydraulic lifting clamp 7 is connected to the second relay switch 30. The fourth directional valve 39 is a solenoid two-position four-way directional valve, which can be controlled by logic: when the second relay switch 30 sends a signal, the fourth directional valve 39 is energized and the hydraulic lifting clamp 7 opens. Similarly, when the hydraulic lifting clamp 7 is closed, a signal is given, the third directional valve 37 is energized, the slip opens, and an interlock is formed. The valve block unit 4 includes a first low-pressure relief valve 41 and a high-pressure relief valve 42. The first interlocking oil circuit 31 and the second interlocking oil circuit 32 are connected through the first low-pressure relief valve 41. The first interlocking oil circuit 31 and the second interlocking oil circuit 32 are connected through the high-pressure relief valve 42. The high-pressure relief valve 42 is also connected to the hydraulic cylinder 5 on the hydraulic slip through the second low-pressure relief valve 43 and the normally open stroke valve 43. The clamping process of the slip: a. When the hydraulic slip is not clamped, the hydraulic oil in the stroke valve 43 is opened, and the hydraulic pressure is low-pressure overflowed through the second low-pressure relief valve 43 of the valve block. b. When the hydraulic slips are clamped, the hydraulic cylinder 5 retracts, the wedge block 6 on the hydraulic slips touches the stroke valve 43, the hydraulic oil in the stroke valve 43 closes, and the hydraulic pressure is released through the high pressure relief valve 42 on the valve block. The system pipeline is under high pressure when the slips are clamped. Kava opening process: During the entire process of opening the hydraulic slip, the hydraulic pressure is released through the first low-pressure relief valve 41 of the valve block, so the system is always under low pressure. When the portable interlock unit 3 is removed from the system and only the first interlock oil circuit 31 and the second interlock oil circuit 32 are retained, the system can still be used normally. Of course, the second oil inlet line 21 and the second oil return line 22 can also completely replace the first interlock oil circuit 31 and the second interlock oil circuit 32. In this case, the system does not have an interlock function. With the addition of the portable interlocking unit 3, the interlocking function can be realized, and it also has signal feedback; In summary, by combining the switching pressure control, accumulator pressure stabilization, back pressure maintenance device, unloading valve 17, and action reversing valve, flexible drive, safety interlock, flexible unlocking, and energy-saving control of wellhead tools are achieved, thereby improving the smoothness, convenience, safety, and work efficiency of the operation.

[0024] In addition to the above embodiments, the present invention also includes other embodiments. All technical solutions formed by equivalent transformation or equivalent substitution should fall within the protection scope of the claims of the present invention.

Claims

1. An energy efficient portable interlocking system for hydraulic slips and hydraulic elevators, characterized in that: The portable interlocking unit (3) comprises an interlocking first oil path (31) and an interlocking second oil path (32), the input end of the interlocking first oil path (31) and the output end of the interlocking second oil path (32) are connected with the control unit (2), and the input end of the interlocking first oil path (31) and the output end of the interlocking first oil path (31) are connected with the hydraulic cylinder (5) on the hydraulic slip. The interlocking first oil path (31) is connected with a first relay switch (33), and the interlocking second oil path (32) is connected with a second one-way valve (34). The interlocking first oil path (31) and the interlocking second oil path (32) are connected through an interlocking pipeline (35), the interlocking pipeline (35) is connected with a second reversing valve (36), a third reversing valve (37) and a third one-way valve (38), and the second reversing valve (36) and the third reversing valve (37) are connected with the interlocking second oil path (32). The portable interlocking unit (3) is further connected with a valve block unit (4). The valve block unit (4) comprises a valve block first low-pressure overflow valve (41) and a valve block high-pressure overflow valve (42), the interlocking first oil path (31) and the interlocking second oil path (32) are connected through the valve block first low-pressure overflow valve (41), the interlocking first oil path (31) and the interlocking second oil path (32) are connected through the valve block high-pressure overflow valve (42), and the valve block high-pressure overflow valve (42) is connected with the hydraulic cylinder (5) on the hydraulic slip through a valve block second low-pressure overflow valve (43) and a stroke valve (43). The power unit (1) comprises an oil tank (11), the oil tank (11) is connected with a first oil inlet pipeline (12) and a first oil return pipeline (13), the first oil inlet pipeline (12) is sequentially connected with a plunger pump (14) and a first one-way valve (15) in the oil inlet direction, the plunger pump (14) is connected with a driving source, and the first oil inlet pipeline (12) is further connected with an unloading valve (17).

2. An energy efficient portable interlocking system for hydraulic slips and hydraulic elevators as claimed in claim 1 wherein: The driving source is a motor (16).

3. An energy efficient portable interlocking system for hydraulic slips and hydraulic elevators as claimed in claim 2 wherein: The control unit (2) comprises a second oil inlet pipeline (21), a second oil return pipeline (22) and a first reversing valve (23), the input end of the second oil inlet pipeline (21) is connected with the output end of the first oil inlet pipeline (12), the output end of the second oil return pipeline (22) is connected with the input end of the first oil return pipeline (13), and the input end of the second oil return pipeline (22) and the output end of the second oil inlet pipeline (21) are connected with the portable interlocking unit (3) through the first reversing valve (23).

4. An energy efficient portable interlocking system for hydraulic slips and hydraulic elevators as claimed in claim 1 wherein: ​ The control unit (2) further comprises a control low-pressure overflow valve (27) and a control high-pressure overflow valve (28), the input ends of the control low-pressure overflow valve (27) and the control high-pressure overflow valve (28) are connected with the second oil inlet pipeline (21), the output ends of the control low-pressure overflow valve (27) and the control high-pressure overflow valve (28) are connected with the second oil return pipeline (22), and the control ends of the control high-pressure overflow valve (28) and the control low-pressure overflow valve (27) are connected with the oil inlet end of the portable interlocking unit (3) and the oil outlet end of the portable interlocking unit (3) respectively.

5. An energy efficient portable interlocking system for hydraulic slips and hydraulic elevators as claimed in claim 4 wherein: The input end of the interlocking first oil way (31) is connected with the first reversing valve (23) and the control end of the control high-pressure overflow valve (28), and the output end of the interlocking second oil way (32) is connected with the first reversing valve (23) and the control end of the control low-pressure overflow valve (27).

6. An energy efficient portable interlocking system for hydraulic slips and hydraulic elevators as claimed in claim 4 wherein: The first reversing valve (23) is a two-position four-way reversing valve.

7. An energy efficient portable interlocking system for hydraulic slips and hydraulic elevators as claimed in claim 4 wherein: The second oil inlet pipeline (21) is connected with an energy accumulator (24) and a pressure gauge (25).

8. An energy efficient portable interlocking system for hydraulic slips and hydraulic elevators as claimed in claim 4 wherein: The second oil return pipeline (22) is connected with an adjustable flow valve (26).

9. An energy efficient portable interlocking system for hydraulic slips and hydraulic elevators as claimed in claim 1 wherein: The second reversing valve (36) is a manual two-position three-way reversing valve, and the third reversing valve (37) is an electromagnetic two-position four-way reversing valve.

10. The energy efficient portable interlocking system for hydraulic slips and hydraulic elevating sockets as claimed in claim 1 wherein: The stroke valve (43) is a normally open type.

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